#include "add.h"
#include "sub.h"

int main() 
{
    int a = 20;
    int b = 10;
    int ret = Add(a, b);
    printf("%d + %d = %d\n", a, b, ret);

    ret = Sub(a, b);
    printf("%d - %d = %d\n", a, b, ret);

    return 0;
}
